# Heat engines, efficiency and refrigerators

> Heat engines are devices that convert heat energy into useful mechanical work. They are found in car engines, power stations, and any machine that uses fuel to produce motion. Refrigerators work in…

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## Full notes

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## More in Thermodynamics

- [First law of thermodynamics](https://www.hlayiso.com/grade-11/technical-sciences/notes/thermodynamics/first-law-of-thermodynamics) — Previous section
- [All Thermodynamics sections](https://www.hlayiso.com/grade-11/technical-sciences/notes/thermodynamics)

## Frequently asked questions

### What will I learn in "Heat engines, efficiency and refrigerators"?

This section covers Heat engines, efficiency and refrigerators as part of Thermodynamics in Grade 11 Technical Sciences. You'll find clear explanations, worked examples, and key definitions aligned to the CAPS curriculum.

### Is this section aligned with the CAPS curriculum?

Yes. All notes on Hlayiso, including "Heat engines, efficiency and refrigerators", are written against the official CAPS curriculum and ATP for Grade 11 Technical Sciences.

### What should I study after "Heat engines, efficiency and refrigerators"?

Continue with the next section in Thermodynamics, or test your understanding with the interactive quiz linked to this section.

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